Patents by Inventor Daniel S. Stoltz

Daniel S. Stoltz has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method and apparatus for sealing a well bore and sidetracking a well from the well bore
    Patent number: 5937955
    Abstract: A method and apparatus for sealing a pilot well and directionally drilling a directional well from the pilot well by the use of a casing including an easily drillable section positioned through a selected zone.
    Type: Grant
    Filed: May 28, 1997
    Date of Patent: August 17, 1999
    Assignees: Atlantic Richfield Co., BP Exploration Alaska, Inc.
    Inventors: David G. Nims, Daniel S. Stoltz
  • Through-tubing rotary drilling
    Patent number: 5860474
    Abstract: A method for recompleting a wellbore containing a casing and a tubing string extending from a surface through the casing to a zone of interest by through-tubing rotary drilling by forming an opening through the casing at a selected point, passing a rotatable drill string including a drill bit through the tubing and drilling a second wellbore by drilling out of the cased wellbore through the opening.
    Type: Grant
    Filed: June 26, 1997
    Date of Patent: January 19, 1999
    Assignee: Atlantic Richfield Company
    Inventors: Daniel S. Stoltz, David G. Nims